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Context manager for running code expected to either raise a specific warning,
|
multiple specific warnings, or not raise any warnings. Verifies that the code
|
raises the expected warning(s), and that it does not raise any other unexpected
|
warnings. It is basically a wrapper around ``warnings.catch_warnings``.
|
|
Parameters
|
----------
|
expected_warning : {Warning, False, tuple[Warning, ...], None}, default Warning
|
The type of Exception raised. ``exception.Warning`` is the base
|
class for all warnings. To raise multiple types of exceptions,
|
pass them as a tuple. To check that no warning is returned,
|
specify ``False`` or ``None``.
|
filter_level : str or None, default "always"
|
Specifies whether warnings are ignored, displayed, or turned
|
into errors.
|
Valid values are:
|
|
* "error" - turns matching warnings into exceptions
|
* "ignore" - discard the warning
|
* "always" - always emit a warning
|
* "default" - print the warning the first time it is generated
|
from each location
|
* "module" - print the warning the first time it is generated
|
from each module
|
* "once" - print the warning the first time it is generated
|
|
check_stacklevel : bool, default True
|
If True, displays the line that called the function containing
|
the warning to show were the function is called. Otherwise, the
|
line that implements the function is displayed.
|
raise_on_extra_warnings : bool, default True
|
Whether extra warnings not of the type `expected_warning` should
|
cause the test to fail.
|
match : str, optional
|
Match warning message.
|
|
Examples
|
--------
|
>>> import warnings
|
>>> with assert_produces_warning():
|
... warnings.warn(UserWarning())
|
...
|
>>> with assert_produces_warning(False):
|
... warnings.warn(RuntimeWarning())
|
...
|
Traceback (most recent call last):
|
...
|
AssertionError: Caused unexpected warning(s): ['RuntimeWarning'].
|
>>> with assert_produces_warning(UserWarning):
|
... warnings.warn(RuntimeWarning())
|
Traceback (most recent call last):
|
...
|
AssertionError: Did not see expected warning of class 'UserWarning'.
|
|
..warn:: This is *not* thread-safe.
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